Strong suppression of superconductivity by divalent ytterbium Kondo holes in CeCoIn5
M. Shimozawa, T. Watashige, S. Yasumoto, Y. Mizukami, M. Nakamura, H. Shishido, S. K. Goh, T. Terashima, T. Shibauchi, Y. Matsuda
DOI 10.1103/PhysRevB.86.144526 · Physical Review B
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Abstract
To study the nature of partially substituted Yb ions in a Ce-based Kondo lattice, we fabricated high quality Ce1−xYbxCoIn5 epitaxial thin films using molecular beam epitaxy. We find that the Yb substitution leads to a linear decrease of the unit cell volume—indicating that Yb ions are divalent, forming Kondo holes in Ce1−xYbxCoIn5—and leads to a strong suppression of the superconductivity and Kondo coherence. These results, combined with measurements of the Hall effect, indicate that Yb ions act as nonmagnetic impurity scatterers in the coherent Kondo lattice without serious suppression of the antiferromagnetic fluctuations. These results are in stark contrast to previous studies performed using bulk single crystals, which claim the importance of valence fluctuations of Yb ions. The present work also highlights the suitability of epitaxial films in the study of the impurity effect on the Kondo lattice.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.95 | Pressure not reported | onset |
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.3 | Pressure not reported | unknown |
| Ce1-xYbxCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | midpoint |
| YbCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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